1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person June 13, 2016.

2. This transaction was executed in multiple trades at prices ranging from $16.05 to $16.30. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

3. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person December 1, 2016.

4. This transaction was executed in multiple trades at prices ranging from $15.15 to $16.50. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

5. Each Restricted Stock Unit represents a contingent right to receive one share of MNTA common stock.

6. Subject to certain criteria, the restricted stock units will vest with respect to 25% of the shares on the first anniversary of the grant date, and the remainder will vest in equal quarterly installments over the subsequent three years.

7. Subject to certain criteria, the stock options will vest with respect to 25% of the shares on the first anniversary of the grant date, and the remainder will vest in equal quarterly installments over the subsequent three years.

/s/ Marie T. Washburn as attorney in fact

02/14/2018

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).